Chalcogen-based aerogels as a multifunctional platform for remediation of radioactive iodine

Riley, Brian J.; Chun, Jaehun; Ryan, Joseph V.; Matyáš, Josef; Li, Xiaohong S.; Matson, Dean W.; Sundaram, S. K.; Strachan, Denis M.; Vienna, John D.

doi:10.1039/c1ra00351h

Cited by 103 publications

(102 citation statements)

References 50 publications

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“…At Pacific Northwest National Laboratory (PNNL), we have made Pt-Ge-S (PtGe 2 S 5 ), Mo-Co-Ni-S (Mo 2 CoNiS 8 ), and Sn-S (Sn 2 S 3 ) chalcogels and the summary collages of methods are presented in Figure 2 (Ryan et al, 2009;Strachan et al, 2010;Strachan et al, 2011;Riley et al, 2011). We evaluated two casting techniques in which we cast the mixed precursors in either polymer vials or petri dishes.…”

Section: Overview Of Chalcogel Fabrication Methodsmentioning

confidence: 99%

“…A new family of non-oxide, chalcogen-based aerogels, called chalcogels, has been reported in the literature (Mohanan et al, 2005;Kalebaila et al, 2006;Bag et al, 2007;Kanatzidis and Bag, 2008;Bag et al, 2009;Bag and Kanatzidis, 2010;Oh et al, 2011;Yuhas et al, 2011b;Yuhas et al, 2011a;ShafaeiFallah et al, 2011;Riley et al, 2011;Polychronopoulou et al, 2012). These chalcogels, because of their potential high affinity for halide gases and their high porosity, were thought to be ideal candidates for removal of 129 I from the process gases at a nuclear fuel reprocessing plant.…”

Section: Introductionmentioning

confidence: 99%

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Initial Assessment of Alternate Metals in Chalcogels

Riley¹,

Lepry²,

Chun³

et al. 2012

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Section: Overview Of Chalcogel Fabrication Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Initial Assessment of Alternate Metals in Chalcogels

Riley¹,

Lepry²,

Chun³

et al. 2012

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“…A paper entitled "ChalcogenBased Aerogels as a Multifunctional Platform for Remediation of Radioactive Iodine" was accepted for publication in the journal RSC Advances (Riley et al 2011). Additionally, two chalcogels containing no Pt were prepared and tested.…”

Section: Progress On Chalcogenide-based Aerogels For the Removal Of Imentioning

confidence: 99%

Summary Report on the Volatile Radionuclide and Immobilization Research for FY2011 at PNNL

Strachan¹,

Chun²,

Matyáš³

et al. 2011

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SUMMARYMaterials were developed and tested in support of the U.S. Department of Energy, Office of Nuclear Energy, Fuel Cycle Technology Separations and Waste Forms Campaign. Specifically, materials are being developed for the removal and immobilization of iodine and krypton from gaseous products of nuclear fuel reprocessing unit operations.During FY 2011, aerogel materials were investigated for removal and immobilization of 129 I. Two aerogel formulations were investigated, one based on functionalized silica and the second on chalcogenbased glasses (i.e., chalcogels). A silica aerogel was tested at ORNL for total I 2 sorption capacity. It was determined to have 48 mass% capacity while having little physisorbed I 2 (I 2 not chemically bound within the aerogel). Metal organic framework (MOF) structures were investigated for the removal and storage of Kr and a new MOF with about 8 mass% capacity for Xe and Kr was formulated and tested. The selectivity can be changed from Xe > Kr to Xe < Kr simply by changing the temperature. A patent disclosure has been filed. Lastly, silicon carbide (SiC) was loaded with Kr. The diffusion of Kr in SiC was found to be less than detectable values at temperatures as high as 500°C.

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“…A new family of non-oxide, chalcogen-based aerogels, called chalcogels, has been reported in the literature (Mohanan et al, 2005;Kalebaila et al, 2006;Bag et al, 2007;Kanatzidis and Bag, 2008;Bag et al, 2009;Bag and Kanatzidis, 2010;Oh et al, 2011;Yuhas et al, 2011b;Yuhas et al, 2011a;ShafaeiFallah et al, 2011;Riley et al, 2011;Polychronopoulou et al, 2012). These are highly porous semisolids made from a variety of S-, Se-, and/or Te-based building blocks that have selective affinity for various heavy metals and gases (Bag et al, 2007;Bag et al, 2009;Bag and Kanatzidis, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…While the concentrations of iodine are low, the required capture efficiencies are very high at ≥99.4% (40 CFR 190, 2012). The initial chalcogel materials tested at PNNL to date show promise as sorbents with >99% capture efficiencies for low iodine concentrations in air (Riley et al, 2011;Riley et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Initial Assessment of the Consolidation of Chalcogels into a Viable Waste Form

Riley¹,

Lepry²

2012

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SUMMARYThis report provides some preliminary data for the consolidation of chalcogen-based aerogels. The chalcogels tested to date at PNNL show great promise as iodine sorbents and preliminary consolidation research shows that they can be melted into a phase-pure glass at moderate temperatures. The preliminary consolidation experiments show that these materials might attack fused quartz so an alternative crucible material will likely need to be used to prevent this. The next steps will be to• Consider melting other chalcogel chemistries, e.g., Sn-Sb-S, Ge-Sn-S chalcogels • Consider melting chalcogels with adsorbed iodine to monitor iodine loss during melting • Optimize the consolidation temperatures to minimize the iodine loss and volatilization

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Chalcogen-based aerogels as a multifunctional platform for remediation of radioactive iodine

Cited by 103 publications

References 50 publications

Initial Assessment of Alternate Metals in Chalcogels

Initial Assessment of Alternate Metals in Chalcogels

Summary Report on the Volatile Radionuclide and Immobilization Research for FY2011 at PNNL

Initial Assessment of the Consolidation of Chalcogels into a Viable Waste Form

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